1. There is a route with a small input current, about 100pA--100nA, I2 is the reference current (set to 2.8nA), the input part of the circuit is as shown below, and the output is AD-converted.
The problem I encountered was that the AD value of this road was unstable and the jump value was quite large. (Exclude the AD problem because the other roads are stable). My analysis may have problems with the I2 setting. Do you have any other suggestions?
2. Some of the Log114 data sheets (page 16) are not fully understood. The first question is related to this part. Can you translate the 16th page into Chinese for me? Or help me translate the paragraph marked. I didn't understand what it meant, thank you!